The goal: diverse resources that interoperate. To get there, grids must be built on standard interfaces and protocols, and the Open Grid Services Architecture maps the path. In <a href="http://www-106.ibm.com/developerworks/grid/library/gr-visual/index.html?ca=dgr-lnxw1wTourOGSA">this article</a>, we lay out the components of OGSA and explain their significance. The Globus Toolkit 3 is the first major implementation of the standard; others are under development.